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Author Topic: Christie ch20 to ch10 conversion William Hooper Phenomenal Film Handler Posts: 1879 From: Mobile, AL USA Registered: Jun 99 posted 03-04-2004 01:50 AM                        What's needed to convert a ch20 to use 1,000w bulbs (basically creating a ch10)? The reflector is different, is the condensor lens also different? Can the CH20 rectifier be easily modified to operate a 1,000 w bulb?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 03-04-2004 08:32 AM                     Why would you want to do that? More light is better than less light anmd you can defocus the lamp to get to 16 to 18 fl anyway. If your screen is relly tiny consider using a three bladed shutter on the projector. But...... A CXL 1000 should fit right in there. Same threads and all. The big problem is if your rectifier will go that low in amperage. If you have 208 three phase it might, but if you have 230 volt 3 phase forget it. Mark  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 03-04-2004 02:19 PM                        I agree. If you have "light to burn", cash it in on a real on-screen advantage like a three-blade shutter (no shutter flicker), better illumination uniformity (backing off on lamp focus), or a better depth of focus (by stopping down the lens). Or even a gray screen, to get better contrast ratio.  |  IP: Logged

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